Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e923e3abba3f27…

MALICIOUS

PDF

97.4 KB Created: 2021-08-18 16:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e54a660882d7799c3f5f701fb3e5aa3c SHA-1: 71af2fde948093473eb35d6ff3067b69e0e30435 SHA-256: 07e923e3abba3f27b785d0030ded4d1a3d43edd8e75ff7bab87cf015e90ae5e1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites, suggesting an attempt to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0c7c3921---mitowisekifesonasurutamo.pdf In PDF document text
    • http://cl-pub.com/files/files/nizogidubabuzurabazedijur.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16213026630857.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f701dbdc8d---bifuxevinapukefife.pdfIn PDF document text
    • https://fultoys.com/userfiles/17540459783.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kupujefomovifuwo.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gaxibasosexet.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/147367a50349cc398ad2cfc40f367916/riparifededab.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lesarogamibewusedewuwun.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075643781a4e---geredutajiwif.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111ed2616415---jimawimagadadote.pdfIn PDF document text
    • https://bor-diing.com/upload/files/16331466466.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3243b0d64---pipolaki.pdfIn PDF document text
    • https://songhong.info/userfiles/file/zefin.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4685337d---98681598904.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4u665jj9pkoc3ofa6foo5q4u2m/99230958625.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/xagaroj.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/379f7277b2ad4a75fbe7b393ba1a4493/87367635263.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///48454087618.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/78838358860.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/fukunagiliginuzupetawe.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/27865896881.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/41189968976.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/sesozinejamerawuburavimam.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o8h58n465tte1klsmu8lqv48n0/10199999209.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/54811213776.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gedapumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ravenfield+beta+5+unblocked+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 10864 bytes
SHA-256: 7869edd0b4c57ea103efafc3384a06b25fbba147f8a44c37cb94c514f8df3ac2
font_02_sfnt_off00014874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14874 17788 bytes
SHA-256: 91f89d50bb54930eb75c28d4413da50460461ef1eadd075a23082e4b5108f999

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